class_docstr: Base class for WK3l datasets (WK3l-15k, WK3l-120k, CN3l).
code: def _cache_sub_directories(self) -> Iterable[str]:  # noqa: D102
      # shared directory for multiple datasets.
      yield "wk3l"
  
imports: import itertools
  import logging
  import pathlib
  from abc import ABC
  from typing import ClassVar, Iterable, Literal, Mapping, Tuple, Union
  import click
  import pandas
  from docdata import parse_docdata
  from more_click import verbose_option
  from pystow.utils import read_zipfile_csv
  from .base import EADataset
  from ...constants import COLUMN_LABELS, PYKEEN_DATASETS_MODULE
  from ...triples import TriplesFactory
  from ...typing import EA_SIDE_LEFT, EA_SIDE_RIGHT, EA_SIDES, LABEL_HEAD, LABEL_TAIL, EASide
label_desc: Use image node_id 2 for calling the MTransEDataset obj's underlying member method code with example usage: obj._cache_sub_directories() without return types